JP5422273B2 - Packaging bag manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a packaging bag with a spout which is divided by a pair of flow path forming seal portion side portions is formed by sealing the two films of the channel.

A packaging bag provided with a spout is widely used, for example, in a packaging bag for storing contents for refilling in order to facilitate the pouring of the contents.
Patent Document 1 describes a bag having a reinforcing mechanism composed of two linear deformations formed by deforming a film in order to prevent the spout portion from being bent.
Patent Document 2 describes a packaging bag in which a reinforcing layer is provided by applying a curable resin or sticking a reinforcing piece to a base material that forms a flow path introducing portion of a spout or a flow path of a spout. .
In Patent Document 3, the planar overhanging portion formed in the region where the unsealing line is applied, the linear first overhanging portion formed in the center line direction, and the first overhanging processing portion An overhang with a pouch wall projecting outwards, such as a linear second overhang part formed on both sides and a linear third overhang part formed in a direction intersecting the center line A pouch container formed with a processed portion is described.

JP 7-2260 A Japanese Patent Laid-Open No. 2004-338753 JP 2007-276837 A

  The packaging bag described in Patent Document 1 has an advantage that no additional material consumption occurs in improving the pouring property. However, the degree of opening of the spout varies depending on the flow rate of the contents passing through the spout, so that when the remaining amount of content decreases, the flow rate of flow decreases and it is difficult to maintain the open state of the spout. There is a problem. In particular, in the case of large business-use packaging bags, compared to small home-use packaging bags, the opening of the spout is maintained until there is almost no residual liquid from the viewpoint of the cost of residual liquid loss and increased work time. A packaging bag that can be maintained is desired.

  Moreover, if a reinforcing layer is provided as a separate member as described in Patent Document 2 or a number of overhanging portions are provided as described in Patent Document 3, the thickness of the packaging bag increases and the empty bag is packed. Sometimes it becomes bulky.

The present invention has been made in view of the above circumstances, and is a packaging bag that can easily maintain the opening state of the spout and can suppress an increase in thickness and bulkiness of the packaging bag due to reinforcement of the spout. and to provide a method of manufacturing.

In order to solve the above-mentioned problems, the present invention provides a spout that is divided by a pair of flow path forming seal portions in which both sides of a flow path seal two films, and the film extends along the flow path. A grooved rib projecting outward, and at least one side of the rib, a manufacturing method of a packaging bag having a cured portion formed by crystallizing at least part of the resin constituting the film, Forming the cured portion by crystallizing at least a part of the resin constituting the film by heating and cooling the film on at least one side of the position of the film before sealing the two films. a curing unit forming step of, by pressing the film with uneven form after the hardening portion is formed, the rib forming step of forming the rib, the curing And after the ribs are formed, the two films are overlapped and sealed to produce a packaging bag, the cured portion is flat, and the ribs have a width of 0.00. 5~3mm and height Ri 0.5~3mm der, to provide a method of manufacturing a packaging bag characterized by Rukoto a gap between the rib and the curing unit.

Before Symbol cured portion is preferably formed between the rib and the channel forming the sealing portion.
It is preferable that the rib forming step is not heated.
The heating of the film in the curing part forming step is preferably performed by bringing a mold having a shape corresponding to the curing part into contact with both surfaces of the film.
The film is preferably cooled in the cured part forming step by bringing a mold having a shape corresponding to the cured part into contact with both surfaces of the film.
In the cooling, it is preferable that the outer surface of the cured portion of the film is roughened by using a mold having a contact surface sandblasted on the side that contacts the outer surface of the film.
Furthermore, it is preferable to have a step of providing an opening assist line at a position crossing the rib.

It is preferable that the film in the cured part forming step, the film in the rib forming step, and the film in the bag making step are continuous films and are conveyed in the order in which the steps are performed .

  According to the present invention, the cured portion formed by crystallizing at least a part of the resin constituting the film on both sides or one side of the groove-like rib formed by the film projecting outward along the flow path. By providing, it becomes easy to maintain the opening state of the spout. Moreover, since the accompanying material consumption does not arise, the thickness increase and bulkiness of a packaging bag can be suppressed.

It is a front view which shows an example of the packaging bag manufactured by this invention. (A) is sectional drawing which follows the AA line of FIG. 1, (b) is the elements on larger scale of the B section of (a). (A) is a front view which shows an example of a state when opening the packaging bag of FIG. 1 and pouring out a content liquid, (b) is sectional drawing which follows the CC line of (a). It is explanatory drawing of the process of forming a rib and a hardening part in a film in the manufacturing method of the packaging bag of this invention. It is a fragmentary sectional view of the vicinity of a spout showing a state where a plurality of empty bags of packaging bags manufactured according to the present invention are stacked. It is a fragmentary sectional view of the vicinity of the spout showing a first modified example of the packaging bag manufactured according to the present invention. It is a fragmentary sectional view of the vicinity of a spout showing the 2nd modification of the packaging bag manufactured by the present invention. It is a front view which shows an example in which the opening assistance line was provided in the position which crosses a rib in the packaging bag manufactured by this invention.

The present invention will be described below based on preferred embodiments with reference to the drawings.
As shown in FIGS. 1 and 2, the packaging bag 10 of this embodiment is folded in two with the two body films 11, 11 having the same planar shape and the folding line 16 a as the center line. A standing pouch comprising a bottom film 16. As shown in FIG. 1, the bottom film 16 is folded between the lower portions of the pair of body films 11 and 11 so that the fold line 16 a faces inward.
Side edge seal portions 11a and 11b are formed on both side edge portions of the packaging bag 10, respectively, and the body film 11, 11 and the bottom film 16 are opposed to each other at the lower portion of the packaging bag 10. The bottom seal portion 16b is formed by heat-sealing the lower end edges of the surfaces.

  As the film used as the body film 11 and the bottom film 16, those conventionally used, for example, films made of biaxially stretched polypropylene, biaxially stretched polyamide, biaxially stretched polyester, etc. are used as the base film. A laminate in which a polyolefin resin such as low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, and polypropylene is laminated as a sealant layer on a base film is used. Examples of the method for producing the laminated film include a dry laminating method, an extrusion laminating method, and a coextrusion method. An adhesive or an anchoring agent can be provided between the base film layer and the sealant layer in order to improve the adhesive strength. In this case, a plurality of substrate films may be laminated in order to increase the strength of the packaging bag. Alternatively, a metal foil such as an aluminum foil, a metal vapor-deposited layer, an inorganic vapor-deposited layer such as ceramic, an ethylene-vinyl alcohol copolymer film, or the like may be laminated in order to improve the barrier property against gas or ultraviolet rays.

Although the dimension of the packaging bag 10 is not specifically limited, As a suitable range as a refill container, the height of the packaging bag 10 is about 100 to 500 mm, the width of the packaging bag 10 (the maximum width between both side edges) ) Is about 70 to 300 mm, and the filling amount of the contents is about 100 to 5000 cm ³ .

As shown in FIG. 1, the spout 12 which has the flow path 13 which faced diagonally upward of the packaging bag is provided in the upper corner part of the packaging bag 10. As shown in FIG.
In the case of this embodiment, the flow path forming seal portions 13a and 13b are formed by heat-sealing the body films 11 and 11 continuously from the upper part of one side edge seal portion 11a. As shown in FIG. 3 (a), these flow path forming seal portions 13a and 13b partition both sides of the flow path 13 when the tip of the spout 12 is removed and the flow path 13 is opened. doing. That is, the unsealed portion between one flow path forming seal portion 13 a and the other flow path forming seal portion 13 b is the flow path 13 of the spout 12.
Moreover, the front-end | tip part of the flow path 13 is closed by the sealing seal part 13c. A space between the flow path forming seal portion 13 b and the side edge seal portion 11 b is opened as a filling port 17, and the packaging bag 10 can be filled with contents through the filling port 17. In addition, after the filling of the contents, the upper part sealing part 18 (refer FIG. 3) is formed by heat-sealing trunk | drum films 11 and 11 in the periphery of the filling port 17, and the filling port 17 is closed.

In order to facilitate opening, the spout 12 has an opening assisting line 12a made of, for example, a half cut groove formed by a laser so as to cross the flow path 13, and a cutout line ( A tab (knob) 12b formed by a penetrating scar) 12c can be provided.
Further, when the opening assisting line 12a is provided at a position crossing the rib 14 as in the packaging bag 100 shown in FIG. 8, the rib 14 is cut when opened, and the rib 14 is included in the cut surface. Therefore, it is easier to maintain the open state of the flow path 13 after opening.
In order to prevent the opening assisting wire 12a from being inadvertently torn due to the tab 12b being caught when not in use, it is preferable to provide one or more uncut portions (not shown) on the cutout line (penetrating scar) 12c. . The width of the uncut portion is, for example, about 0.5 to 1.5 mm so that it can be easily separated by hand at the time of opening, although it depends on the material of the body film 11.

  In the packaging bag 10 according to the present embodiment, the film 11 is formed on both sides of the rib-shaped rib 14 formed by the film 11 projecting outward along the flow path 13 of the spout 12. Hardened portions 15a and 15b formed by crystallizing at least part of the resin are provided.

As shown in FIG. 2 (b), the rib 14 is formed by forming a plurality of linear deformations 14a, 14b, 14c, and 14d in the film 11 into a groove shape, and providing a crease for bending. . Ribs 14 and linear deformation 14a, 14b, 14c, 14d are you formed by pressing the film 11 in a concavo-convex type. When viewed from the outside of the bag, the inner linear deformations 14a and 14b are mountain folds, and the outer linear deformations 14c and 14d are valley folds.
In forming the ribs, it is preferable to pressurize the film without heating (for example, at a room temperature of about 10 to 40 ° C.). When it is not heated, the flowability of the resin constituting the film 11 is low, so that the formation of the fine ribs 14 becomes easier, and the wrinkles of the linear deformations 14a, 14b, 14c, 14d are further enhanced. It is possible to form a strong rib 14 that is not easily crushed.

The number of linear deformations constituting one rib 14 is four in FIG. 2, but may be two or three. The width of the rib 14 is 0.5 to 3 mm. The height of the ribs 14 is 0.5 to 3 mm.
Here, the width of the ribs 14 refers to the distance between the furthest ones of a plurality of linear deformations constituting one rib 14. In the case of FIG. 2B, the distance w ₂ between the outer linear deformations 14 c and 14 d corresponds to the width of the rib 14. Also, inside the linear deformation 14a, 14b a distance _{w 1} of each other, either the same extent as _{w 2,} preferably smaller than _{w 2.}
The height h of the rib 14 corresponds to the depth of the groove on the inner surface side of the film 11. When one rib 14 is composed of two linear deformations (see, for example, Patent Document 1: FIG. 2 of Japanese Patent Laid-Open No. 7-2260), only the linearly deformed linear deformations 14a and 14b are linear deformations. A groove-shaped cross section can be formed by forming the film 11 in a curved shape instead of the valley-like linear deformations 14c and 14d.

The curing portions 15a and 15b are portions where the film 11 is locally cured. The hardened portions 15a and 15b are formed between the rib 14 and the flow path forming seal portions 13a and 13b, respectively.
Thereby, at the time of empty bag, as shown in Drawing 2 (a), spout 12 can be made almost flat. Moreover, as shown in FIG. 5, the bulk when several packaging bags 10 are overlap | superposed can be suppressed by shifting the position of the rib 14 little by little alternately.
The gap between the cured portion 15a, 15b and the rib 14, the curing unit 15a, since the uncured portion between 15b by press-forming to permit some misalignment when forming the ribs 14, slightly Ru a gap.

In use, the ribs 14 are more easily bent than the hardened portions 15a and 15b. Therefore, when the packaging bag 10 is opened and the contents are poured out, as shown in FIG. Further, the hardened portions 15a and 15b on both sides open to the left and right with the flow path forming seal portions 13a and 13b as fulcrums.
Since the film 11 that forms the flow path 13 has the curing portions 15a and 15b, the opening state of the spout 12 can be maintained even if the flow rate of the content decreases. Moreover, since the rib 14 is provided in the substantially center of the flow path 13, the cross-sectional area when the flow path 13 opens can be enlarged.
As a result, as shown in FIG. 3A, the opened spout 12 is directed (or inserted) toward the spout 2 of the container 1 to efficiently refill the contents from the packaging bag 10 into the container 1. Can be implemented.
When the outer edge shape of the flow path forming seal portion 13a on the side close to the spout 2 protrudes toward the side surface of the spout 2 as shown in FIG. It becomes easy to match the position of the spout 12 with the spout 2 by abutting against the side surface. Or as shown in FIG. 8, you may make it the outer edge shape of the flow-path formation seal | sticker part 13a difficult to contact | abut the side surface of the spout 2. As shown in FIG.

In this embodiment, the curing unit 15a, formation of 15b, by carrying out the process of heating and cooling of the film 11, Ru good at least a portion of the resin constituting the film 11 in a method for crystallizing. As other methods, the cured portion can be formed by a method of locally applying and curing an ultraviolet curable resin, a method of attaching a molded product, or the like. Since the material itself is cured, there is an advantage that no additional material consumption occurs.

Crystalline polymer resins are known as resins that can be crystallized by heating and cooling processes. Crystalline polymer resins have a highly ordered molecular arrangement and generally have small polymer side chains. Further, when the crystalline polymer resin is melt-molded, if it is rapidly cooled to a glass state, the transparency and flexibility are improved, but the crystallinity is lowered. For this reason, in the film 11, the crystallinity of the crystalline polymer resin is low. Therefore, when a specific portion of the film 11 is heated to near the melting point (at least above the glass transition temperature) and cooled, for example, for 1 minute or more, the crystallinity of the film 11 is locally increased, and the cured portion 15a. 15b can be formed.
As specific examples of the crystalline polymer resin, polyethylene, polypropylene, polyethylene terephthalate, isotactic polystyrene, and the like are known. Among them, those having a melting point of less than 200 ° C., such as polyethylene (HDPE, MDPE, LDPE, LLDPE) and polypropylene (CPP, OPP), are materials used for the film 11 of the packaging bag 10 and are crystallized at the time of bag making operation. This is preferable because the conversion process can be easily performed.

FIG. 4 is an explanatory diagram of a process of forming the ribs 14 and the cured portions 15a and 15b on the film 11 when the packaging bag 10 of the present embodiment is manufactured.
As shown in FIG. 4, the hardened part forming process and the rib forming process are preceded by the hardened part forming process and later in the rib forming process.

[Curing part forming step]
As shown to (a), the film 11 is locally heated by the heating means 21 provided with a pair of heating type | molds 21a and 21b in the at least one side of the position used as the rib 14. FIG. In order to specify the position where the rib 14 is to be formed before the rib 14 is formed, it is preferable that marking or the like is applied to an appropriate position of the film 11 and the cured portions 15a and 15b are formed based on the marking.
Next, as shown in (b), the film 11 is locally cooled by the cooling means 22 including a pair of cooling dies 22a and 22b at the location heated by the heating means 21 of (a).
By performing the heating and cooling processes in this manner, at least a part of the resin constituting the film 11 can be crystallized to form the cured portions 15a and 15b.
The heating molds 21 a and 21 b and the cooling molds 22 a and 22 b are molds corresponding to the curing portions 15 a and 15 b, and are in contact with both surfaces of the film 11.
Of the cooling molds 22a and 22b, the cooling mold 22a on the side that comes into contact with the outer surface of the film 11 is preferably one having a contact surface with the film 11 roughened by sandblasting. Thereby, the outer surface side of the hardened portions 15a and 15b of the film 11 can be roughened by transfer from the mold, and there is an advantage such as slip prevention. In the sandblasting, for example, the particle size of the particles used for processing is # 10 to 100, and the surface roughness of the contact surface is about 1 to 100 μm.

[Rib formation process]
As shown in (c), the film 11 on which the hardened portions 15a and 15b are formed is pressed by a pressing means (concave / convex mold) 23 having a concave mold 23a and a convex mold 23b, whereby ribs are formed as shown in (d). 14 is formed. As described above, a gap is formed between the hardened portions 15a and 15b and the rib 14. Moreover, it is preferable that both the concave mold 23a and the convex mold 23b are not heated.
[Bag making process]
The film 11 in which the hardened portions 15a and 15b and the ribs 14 are formed at predetermined positions in the region where the spout 12 is to be provided is conveyed along the rollers 24 and 25, and two sheets are overlapped as shown in FIG. Is done. A bottom film 16 folded in half is supplied between the body films 11 and 11. The bag making method can be carried out using a conventionally known method. For example, the packaging bag 10 is manufactured by forming seal portions such as the side edge seal portions 11a and 11b, the flow path forming seal portions 13a and 13b, and the bottom seal portion 16b, and cutting the outer shape.
When forming a notch etc. in the edge of the packaging bag 10, after each packaging bag 10 is isolate | separated, it can form in a desired position using a cutter or a punching machine. Moreover, notch etc. can also be formed together when forming the external shape of a packaging bag.

[Opening auxiliary line forming process]
The opening assist line 12a can be formed, for example, by half-cutting the film by laser irradiation. When the laser irradiation is performed so as to cross the rib 14 as in the packaging bag 100 of FIG. 8, the focal point of the laser irradiation may be moved along the surface shape of the rib 14.

  As mentioned above, although this invention has been demonstrated based on suitable embodiment, this invention is not limited to the above-mentioned example, Various modifications are possible in the range which does not deviate from the summary of this invention.

  Although FIG. 1 shows an example in which the hardened portions 15a and 15b are provided on both sides of the rib 14, one side may be used. In this case, as shown in FIG. 3, it is preferable to provide a hardened portion 15a on the lower side of the rib 14 at the time of pouring. In addition, as shown in FIG. 6, a plurality of ribs 14 can be provided side by side on one film 11. Moreover, as shown in FIG. 7, the position of the rib 14 can also be shifted between the front and back of the bag.

1 is curved so that the angle with respect to the width direction of the packaging bag 10 approaches 0 ° toward the outer side in the width direction of the packaging bag 10 (left side in FIG. 1), and the ribs 14 are flow paths. However, the shape of the spout and the direction of the flow channel can be appropriately designed from the viewpoint of ease of pouring and manufacturing, and are not particularly limited. For example, the spout may have a straight flow path. Moreover, the shape which the front-end | tip part of the spout protrudes from one side of the packaging bag may be sufficient.
The bottom film 16 is not essential, and the present invention can also be applied to a packaging bag composed of a flat bag such as a three-side seal bag or a four-side seal bag.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for packaging bags filled with fluid contents such as liquids, powders, granules, or a mixture thereof.

DESCRIPTION OF SYMBOLS 10,100 ... Packaging bag, 11 ... Body film, 11a, 11b ... Side edge seal part, 12 ... Outlet, 13 ... Flow path, 13a, 13b ... Lower flow path formation seal part, 14 ... Groove-shaped Ribs, 15a, 15b ... hardened parts.

Claims (8)

A spout formed by a pair of flow path forming seal portions formed by sealing two films on both sides of the flow path, and a groove shape in which the film protrudes outward along the flow path A manufacturing method of a packaging bag having a rib and a cured portion formed by crystallizing at least a part of a resin constituting the film on at least one side of the rib,
Forming the cured portion by crystallizing at least a part of the resin constituting the film by heating and cooling the film on at least one side of the position of the film before sealing the two films. A cured part forming step,
A rib forming step for forming the rib by pressing the film with a concavo-convex mold after the cured portion is formed ;
A bag making process for producing a packaging bag by stacking and sealing the two films after the cured portion and the rib are formed;
The hardened part is flat, the ribs, and wherein Rukoto a gap between Ri is 0.5~3mm der width 0.5~3mm and height, and the cured portion and the rib Manufacturing method for packaging bags. The method for manufacturing a packaging bag according to claim 1 , wherein the hardened portion is formed between the rib and the flow path forming seal portion. The said rib formation process is non-heating, The manufacturing method of the packaging bag of Claim 1 or 2 characterized by the above-mentioned. The packaging bag according to any one of claims 1 to 3 , wherein the heating of the film in the curing portion forming step is performed by bringing a mold having a shape corresponding to the curing portion into contact with both surfaces of the film. Manufacturing method. Wherein the cooling of the film by curing portion forming step, packaging bag according to any one of claims 1 to 4, characterized in that by contacting a mold having a shape corresponding to the hardened part on both surfaces of the film Manufacturing method. The time of cooling, the the side abutting the outer surface of the film using a mold abutment surface is sandblasted, according to claim 5, characterized in that roughening the outer surface of the cured portion of the film Manufacturing method for packaging bags. Furthermore, the manufacturing method of the packaging bag in any one of the Claims 1 thru | or 6 which has the process of providing an opening assistance line in the position which crosses the said rib. Wherein a film the film and are continuous with the film in the curing portion forming step and the film in the rib forming step to the bag process, we claim 1, characterized in that it is carried in the order of performing the steps 7 The manufacturing method of the packaging bag in any one of.

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